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seen Jun 27 at 7:01

Oct
7
comment Questions about cracking playfair using a 'shotgun climbing hill' method
@furskytl: OK, I've added something on that to the answer.
Oct
7
revised Questions about cracking playfair using a 'shotgun climbing hill' method
response to comments
Oct
7
revised Solve the phase plane equation to obtain the integral curves for the system:
wrote out solution in response to comment
Oct
7
comment Solve the phase plane equation to obtain the integral curves for the system:
@anon: I'd written this out but then removed it because I saw the question is on homework; I'll write it out again.
Oct
7
answered Solve the phase plane equation to obtain the integral curves for the system:
Oct
7
comment Solve the phase plane equation to obtain the integral curves for the system:
The references to "him" no longer make sense after you edited out your boyfriend.
Oct
7
comment Always oddly-many ones in the binary expression for $10^{10^{n}}$?
Could you describe how you got up to $n=9$? When I take the direct approach and calculate the powers using Java's BigInteger class, already $n=7$ takes a long time; I'd presume that they use efficient methods to calculate the powers; are you doing something more sophisticated?
Oct
7
revised converting integrand limits from Cartesian to spherical
improve answer in reponse to comments
Oct
6
answered converting integrand limits from Cartesian to spherical
Oct
6
comment Residue integral problem
No special treatment is required for the cosine. You can just substitute the pole $z_0$ into $f(z)(z-z_0)$ like you would with any other function.
Oct
6
revised Name of property describing the number of times a function changes concavity?
formatting
Oct
6
comment HAKMEM 123: Fourier Clocks
In fact it doesn't, at least not for general sequences of curves. For instance, a sequence of curves that wrap $n^2$ times around concentric circles of radius $1/n$ has the constant curve at the centre as its limit, but the arc lengths diverge.
Oct
6
comment HAKMEM 123: Fourier Clocks
Rigorously speaking, how does the arc length of the partial sums going to infinity imply that the limit curve isn't rectifiable?
Oct
6
revised HAKMEM 123: Fourier Clocks
corrected sum
Oct
6
answered Questions about cracking playfair using a 'shotgun climbing hill' method
Oct
5
revised What's the distance between a ray and a sphere?
slight addendum
Oct
5
answered What's the distance between a ray and a sphere?
Oct
5
comment How to obtain a possible state space representation of this 2nd order transfer function?
I've cancelled my downvote since the question now provides context. I'm not sure how to interpret your comment "joriki thinks that it is a question without context [...] I can't add more information than that", which you apparently made after adding the additional information, i.e. when the question was no longer in the form I'd originally criticized.
Oct
5
comment How to obtain a possible state space representation of this 2nd order transfer function?
@madmax: I disagree. I'm probably not the only one here who knows little about control theory but enough about transfer functions and differential equations to perhaps be able to help if you formulate the question in a form accessible to a wider audience.
Oct
5
comment How to obtain a possible state space representation of this 2nd order transfer function?
I'm downvoting this question because after having been made aware at this question of the need for context, you are again posting a question without context. What are $s$, $x$, $u$ and $y$?